Filament box



FIG. 1 is a front, top, and right perspective view of a filament box showing the new design;

FIG. 2 is a front elevation view of the filament box of FIG. 1;

FIG. 3 is a right side elevation view of the filament box of FIG. 1;

FIG. 4 is a back side elevation view of the filament box of FIG. 1; and

FIG. 5 is a left side elevation view of the filament box of FIG. 1;

FIG. 6 is a top plan view of the filament box of FIG. 1; and,

FIG. 7 is a bottom plan view of the filament box of FIG. 1.

The broken lines shown represent portions of the filament box that form no part of the claimed design. 

CLAIM The ornamental design for a filament box, as shown and described. 